Season the chicken breast evenly on both sides with sea salt, black pepper, chili powder, and cumin.
Heat the olive oil in a medium skillet over medium-high heat.
Add the chicken to the skillet and cook for 6 to 7 minutes per side, or until the internal temperature reaches 165°F.
While the chicken is cooking, rinse and drain the black beans, and chop the romaine lettuce, tomato, and red onion.
In a large bowl, create a base with the chopped romaine lettuce.
Layer the black beans, diced tomatoes, and red onion over the lettuce.
Once the chicken is finished, let it rest for 2 minutes before slicing it into strips.
Place the sliced chicken on top of the bowl, garnish with the avocado slices, and drizzle with fresh lime juice before serving.